<div class="apiDetail">
    <div>
        <h2><span>Function(treeNode, expandFlag, sonSign, focus, callbackFlag)</span><span class="path">zTreeObj.</span>expandNode
        </h2>
        <h3>Overview<span class="h3_info">[ depends on <span
                class="highlight_green">jquery.ztree.core</span> js ]</span></h3>
        <div class="desc">
            <p></p>
            <div class="longdesc">
                <p>Expand or collapse single node.</p>
                <p class="highlight_red">Use expandNode() method of zTree v3.x can trigger 'beforeExpand / onExpand' or
                    'beforeCollapse / onCollapse' callback function. for reduce redundant code.</p>
                <p class="highlight_red">Please use zTree object to executing the method.</p>
            </div>
        </div>
        <h3>Function Parameter Descriptions</h3>
        <div class="desc">
            <h4><b>treeNode</b><span>JSON</span></h4>
            <p>JSON data object of the node to be expanded or collapsed</p>
            <p class="highlight_red">Please ensure that this data object is an internal node data object in zTree.</p>
            <h4 class="topLine"><b>expandFlag</b><span>Boolean</span></h4>
            <p>expandFlag = true means: expand the node.</p>
            <p>expandFlag = false means: collapse the node.</p>
            <p class="highlight_red">If this parameter is omitted, then toggle expand or collapse depend this node's
                expanded state.</p>
            <h4 class="topLine"><b>sonSign</b><span>Boolean</span></h4>
            <p>sonSign = true means: expand or collapse all of the child nodes depend the 'expandFlag' parameter.</p>
            <p>sonSign = false means: only expand or collapse this node.</p>
            <p class="highlight_red">When sonSign = false and treeNode.open = expandFlag, will not trigger the
                callback.</p>
            <p class="highlight_red">If this parameter is omitted, it is same as 'sonSign = false'.</p>
            <h4 class="topLine"><b>focus</b><span>Boolean</span></h4>
            <p>focus = true means: after expand or collapse, set the focus of this node for view.</p>
            <p>focus = false means: after expand or coolapse, don't set the focus of this node.</p>
            <p class="highlight_red">If this parameter is omitted, it is same as 'focus = true'.</p>
            <h4 class="topLine"><b>callbackFlag</b><span>Boolean</span></h4>
            <p>callbackFlag = true means: call this method, will trigger 'beforeExpand / onExpand' or 'beforeCollapse /
                onCollapse' callback.</p>
            <p>callbackFlag = false means: call this method, will not trigger callback.</p>
            <p class="highlight_red">If this parameter is omitted, it is same as 'callbackFlag = false'</p>
            <h4 class="topLine"><b>Return </b><span>Boolean</span></h4>
            <p>return the result of expand or collapse.</p>
            <p>true means: expand node</p>
            <p>false means: collapse node</p>
            <p>null means: the node is not parent node.</p>
        </div>
        <h3>Examples of function</h3>
        <h4>1. Expand the first selected node. (and expand this node's child nodes)</h4>
        <pre xmlns=""><code>var treeObj = $.fn.zTree.getZTreeObj("tree");
var nodes = treeObj.getSelectedNodes();
if (nodes.length>0) {
	treeObj.expandNode(nodes[0], true, true, true);
}
</code></pre>
    </div>
</div>